Braking Vibration -- I'm at a loss

[Engineer90]

If you are trying to verify a bad wheel bearing, grab your coil spring when you spin the wheel. A worn bearing will transfer vibration to the coil spring.

I feel some bounce along with the vibration at times, made me think the spring was bad. I am 99% sure it's the bearing that went bad on me

 

[anotero]

If you consider that a wheel bearing is a sealed unit with a bunch of oversized ball bearings held in place in the race by a shmear of greasy goop, then it makes sense that any rattling is indicative of greasy goop withdrawal.

My thoughts exactly.

 

[anotero]

Can a CV joint get damaged even though the boot is fine?

 

[Wrath And Tears]

Can a CV joint get damaged even though the boot is fine?

Yes, they can get worn over time causing the joint to be loose and knock (but not make the clicking) this would cause vibration when driving, normally felt during acceleration. Usually only seen on higher mileage cars, like 150K though. That being said anything is possible and it could have been slightly defective from the get go.

Never heard of one damaged from impact that didn't affect other components as well.

 

[Engineer90]

Can a CV joint get damaged even though the boot is fine?

Yup, happened on my old Audi TT. What happened was that on sharp turns, I would hear and feel like some "clanking" like the thing was about to break off. The boot was fine, but the damn thing was so old so it went bad. Plus, I beat the f**k out of it when I was in college, the roads were like bombs hit the them...

 

[anotero]

Yes, they can get worn over time causing the joint to be loose and knock (but not make the clicking) this would cause vibration when driving, normally felt during acceleration. Usually only seen on higher mileage cars, like 150K though. That being said anything is possible and it could have been slightly defective from the get go.



Never heard of one damaged from impact that didn't affect other components as well.

I hear no clicking or knocking besides the "mouse clicks" from my steering column which may just be the clock spring, but definitely not the driveline components.
I do feel a shudder when accelerating somewhat rapidly from 70 to 80. The shudder then decays and I'm left with the steering wheel/body vibrations.

 

[cb1111]

Can a CV joint get damaged even though the boot is fine?

Yes but... not until you have lots of miles

Yes, they can get worn over time causing the joint to be loose and knock (but not make the clicking) this would cause vibration when driving, normally felt during acceleration. Usually only seen on higher mileage cars, like 150K though. That being said anything is possible and it could have been slightly defective from the get go.

Never heard of one damaged from impact that didn't affect other components as well.

Yep

Yup, happened on my old Audi TT. What happened was that on sharp turns, I would hear and feel like some "clanking" like the thing was about to break off. The boot was fine, but the damn thing was so old so it went bad. Plus, I beat the f**k out of it when I was in college, the roads were like bombs hit the them...

and, like everyone says, the CV joints can wear without visible boot damage, but normally only in very high mileage (or badly abused) cars.

 

[anotero]

Yes but... not until you have lots of miles



Yep



and, like everyone says, the CV joints can wear without visible boot damage, but normally only in very high mileage (or badly abused) cars.

Going to set aside that lunch money in case i need to replace the entire driveline.

 

[Engineer90]

Going to set aside that lunch money in case i need to replace the entire driveline.

I highly doubt our problem is the CV axle, I'm 99% the bearings are it

 

[anotero]

I highly doubt our problem is the CV axle, I'm 99% the bearings are it

I sure as hell hope so. Given the audible evidence, it's the bearings at the very least. Anxious to get this fixed, tired of driving 55 max.

 

[anotero]

I highly doubt our problem is the CV axle, I'm 99% the bearings are it

Well, believe it or not, after I pulled out the bent 034 dogbone insert last night, the braking vibration subsided considerably. Will see if the wheel bearing replacement will eliminate it completely.

 

[cb1111]

Well, believe it or not, after I pulled out the bent 034 dogbone insert last night, the braking vibration subsided considerably. Will see if the wheel bearing replacement will eliminate it completely.

Did I miss the post in this thread where you mentioned a dogbone?

 

[anotero]

Did I miss the post in this thread where you mentioned a dogbone?

No, there was no such post. I did post about removing that bent insert in the "What did you do to your mk7 today" topic, but that was completely unrelated to this thread. I got so absorbed in straightening out all the issues with my car (they are nothing super major, but still), that I started assuming everyone's in my head.

 

[cb1111]

No, there was no such post. I did post about removing that bent insert in the "What did you do to your mk7 today" topic, but that was completely unrelated to this thread. I got so absorbed in straightening out all the issues with my car (they are nothing super major, but still), that I started assuming everyone's in my head.

Maybe not...

 

[anotero]

Maybe not...

yeah, unrelated until I decided to test the presence and strength of the braking vibration. There must be some frequency overlap in the chassis due to multiple components. Wheel bearing change tomorrow, keeping my fingers crossed.